This project contains the "overlap" shader for Unity Shader Graph, created as part of the following tutorial on my website:
kylewbanks.com/blog/creating-overlap-underwater-night-vision-effects-in-shader-graph
Here's a look at the results using the shader for an underwater effect as well as an x-ray or night vision style effect:
Everything is available under MIT license and the demo models are CCO public domain from kenney.nl, so feel free to use it in your own projects.